[R] Error in apply(x2, 1, diff) : dim(X) must have a positive length

[hithit168]

Anyone knows hat might be the cause of this error? Thanks for any help!

>library(MASS)
> dif.mns = function(x2,tr1=.2,tr2=.3){ 
+ #generates four different 'means' using 
+ #difference scores from x2, an n x 2 matrix
+ #for use w/ bootstrap comparisons 
+     diffs = apply(x2,1,diff)  
+     mn1=mean(diffs) 
+     mn2=mean(diffs,tr=.2) 
+     mn3=mean(diffs,tr=.3) 
+     mn4=median(diffs) 
+ mns=c(mn1,mn2,mn3,mn4)  
+ list(mnds=round(mns,3)) } 

> dif.mns(shoes)
Error in apply(x2, 1, diff) : dim(X) must have a positive length

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